Seiko Cal. 4540 - 737

This Spring Drive model from 1981 features a 35mm Two-Tone case. The Bidirectional bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-9855ffd66bd4]

Also known as: Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

10.4mm

Lug Width

21mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

150m

Dial Color

Burgundy

Jewels

20j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1981

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